AT&T's System V, or SysV, UNIX set many of the standards used on today's UNIX and Linux systems. One of these was a method of starting system services, including servers. In the SysV scheme, each service comes with a script that can be used to start or stop the service by passing the script the start or stop parameter, respectively. Many of these startup scripts support additional parameters, such as restart to shut down the server and start it up again (say, to implement a changed configuration).
The SysV startup scheme is closely tied to the runlevel of the computer. Each runlevel is associated with a specific set of startup scripts, and hence with a specific set of services that the system runs. (SysV scripts can start more than just network servers; they can start system loggers, filesystem handlers, and so on.) Thus, configuring servers to start via SysV scripts is closely related to configuring these runlevels. This is done by altering the names of links to the startup scripts, as stored in directories associated with each runlevel.
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